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ICP-OES测定硝酸盐中锂、钠含量的不确定度评估

The Evaluation of Uncertainty on Determination of Lithium and Sodium Elements in Nitrate by ICP-OES
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摘要 依据JJF 1059.1-2012《测量不确定度评定与表示》[1]和CNAS-GL006:2019《化学分析中不确定度的评估指南》[2],对电感耦合等离子体法(ICP-OES)测定硝酸盐中的锂和钠含量的检测结果进行不确定度分析。首先,建立了数学模型;其次,通过分析确定测量不确定度主要来源于样品称量、溶液配制、标准曲线拟合、测量重复性、标样和仪器的稳定性等9大因素;然后,分别评定了各个因素的标准不确定度,通过评估发现,标准溶液配制过程和标准溶液曲线拟合过程是影响不确定度的主要因素;最后,根据各项因素的不确定度评定结果进行计算得出ICP-OES法测定硝酸盐中的钠含量的扩展不确定度为9.14%,锂含量的扩展不确定度为2.92%,给使用结果的人员提供了科学的数据支持。 The uncertainty analysis of the detection results of ICP-OES method for the determination of lithium and sodium in nitrate is carried out according to JJF 1059.1-2012“Evalnation and expression of uncertainty in measurement”and CNAS-GL006:2019“Guidance on quantifying uncertainty in chemical analysis”.Firstly,a mathematical model is established.Next,through analysis,it is determined that the measurement uncertainty mainly from nine factors,such as sample weighing,solution preparation,standard curve fitting,measurement repeatability and the stability of the standard sample and the instrument,etc.Then,the standard uncertainties of each factor are evaluated,and it is found that the process of standard solution preparation and the curve fitting process of the standard solution are the main factors affecting the uncertainty.Finally,according to the uncertainty evaluation results of each factor,the extended uncertainty of ICP-OES method for the determination of sodium content in nitrate is 9.14%,and the extended uncertainty of lithium content is 2.92%,which provides scientific data support for the personnel who used the results.
作者 刘芳 LIU Fang(BYD Precision Manufacturing Co.,Ltd.,Shenzhen 518116,China)
出处 《电子质量》 2024年第2期58-63,共6页 Electronics Quality
关键词 硝酸盐 电感耦合等离子体法 不确定度 nitrate ICP-OES lithium sodium uncertainty
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